Fix quickly, with directions (6)
I believe the answer is:
fasten
'fix' is the definition.
(I know that fix can be written as fasten)
'quickly with directions' is the wordplay.
'quickly' becomes 'fast' (synonyms).
'with' is a charade indicator (letters next to each other).
'directions' becomes 'en' (east and north).
'fast'+'en'='FASTEN'
(Other definitions for fasten that I've seen before include "Close, make secure" , "Fix securely" , "Fix to, secure" , "Tie, secure" , "Affix" .)